【摘要】 滑脱面空间特征的研究可以反映次级浅断裂与区域深断裂之间的构造关系,在西宁盆地中,第三纪地层在NNE向区域挤压应力作用下,沿近NW向发生弯曲褶皱变形。利用平衡剖面方法,通过对垂直构造走向的一条剖面进行反演,得到西宁盆地的滑脱面深度在4~5 km,并向南倾,与物探资料得到的盆地沉积盖层的底界位置和形态基本相同。因此得出盆地沉积盖层的变形方式以柔皱褶曲为主,并沿沉积盖层底界进行滑脱。同时根据区域地震背景分析,认为在西宁盆地浅滑脱的结构面不具备强震的发震条件。更多还原

【Abstract】 The space features of the detachment surfaces show the tectonic connection between the shallow secondary faults and the regional deep faults.In the Xining basin,the Tertiary stratum deformation occurs along the direction of NW under action of the regional compressional stress along the direction of NNE.With the balanced profile technology,we draw a conclusion that the detachment surfaces in Xining basin is located at depth of 4~5 kilometers beneath the surface,and inclines towards south,the same result is obtained from the physical exploration data.We consider that the deformation pattern of the sediment cover in the basin is mainly folded,and surges along the bottom of the sediment cover.Based on the analysis above,it is concluded that the shallow detachment surfaces in Xining basin has no background for the strong shock occurrence.更多还原